US5831532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Identification tags using amorphous wire
Assignee: Intermec IP Corp
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Filing: 1997-08-12
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Granted: 1998-11-03
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Expires: 2017-08-12
Abstract
Abstract An inexpensive multibit magnetic tag is described which uses an array of amorphous wires in conjunction with a magnetic bias field. The tag is interrogated by the use of a ramped field or an ac field or a combination of the two. The magnetic bias is supplied either by coating each wire with a hard magnetic material which is magnetized or by using magnetized hard magnetic wires or foil strips in proximity to the amorphous wires. Each wire switches at a different value of the external interrogation field due to the difference in the magnetic bias field acting on each wire.
Inventors
- 👤 Richard Joseph Gambino
- 👤 Alejandro Gabriel Schrott
- 👤 Robert Jacob von Gutfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:54
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G06; G06K; G06K19/00; G06K19/06; G06K19/06187; G06K19/067; G08B13/2414; G08B13/2417; G08B13/2428; G08B13/2437; G08B13/2442
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
An electronic article surveillance device for interrogation in an oscillatory magnetic field of period T, said device comprising a single piece of amorphous wire, said wire having domains within the inner core of said wire oriented along a direction parallel to the axis of said wire, said wire having length L and an inner core domain wall velocity, V, such that: L≈(VT)/2.
Claim 2
Dependent Claim
62 words
An electronic article surveillance device for interrogation in an oscillatory magnetic field of period T, said device comprising a single piece of amorphous wire, said wire having domains within the inner core of said wire oriented along a direction parallel to the axis of said wire, said wire having length L and an inner core domain wall velocity, V, such that: L≈(VT)/2.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-11-02 | 2002-05-04 | 2002-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-02 | 2006-05-04 | 2006-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-02 | 2010-05-04 | 2010-11-03 | $7700.00 | Window Closed / Lapsed |